/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.apache.linkis.rpc.interceptor

import org.apache.linkis.common.ServiceInstance

import scala.runtime.BoxedUnit


trait RPCInterceptorChain {
  def getApplicationName: String
  def handle(rpcInterceptorExchange: RPCInterceptorExchange): Any
}
class BaseRPCInterceptorChain(index: Int, rpcInterceptors: Array[RPCInterceptor], applicationName: String) extends RPCInterceptorChain {
  def getRPCInterceptors: Array[RPCInterceptor] = rpcInterceptors
  override def handle(rpcInterceptorExchange: RPCInterceptorExchange): Any = if (index < rpcInterceptors.length) {
    val rpcInterceptor = rpcInterceptors(index)
    val chain = increment()
    rpcInterceptor.intercept(rpcInterceptorExchange, chain)
  } else BoxedUnit.UNIT

  def increment(): RPCInterceptorChain = new BaseRPCInterceptorChain(index + 1, getRPCInterceptors, applicationName)

  override def getApplicationName: String = applicationName
}
class ServiceInstanceRPCInterceptorChain(index: Int, rpcInterceptors: Array[RPCInterceptor], serviceInstance: ServiceInstance)
  extends BaseRPCInterceptorChain(index, rpcInterceptors, serviceInstance.getApplicationName) {
  def getServiceInstance: ServiceInstance = serviceInstance

  override def increment(): RPCInterceptorChain = new ServiceInstanceRPCInterceptorChain(index + 1, getRPCInterceptors, serviceInstance)
}